"""Regression tests for the Plotly canvas push contract.

``Plotly.react`` resets any scene attribute the incoming layout omits, so a
data-only push must be flagged ``preserveView`` (the JS side then carries the
live camera and axis ranges forward). Only explicit re-frames may send the
computed framing. These tests capture the JavaScript the canvas emits instead
of driving the browser, so they stay fast and deterministic.
"""

from __future__ import annotations

import json
from pathlib import Path

import pytest

pytest.importorskip("PySide6")
pytest.importorskip("plotly")

from otko.services import load_project

EXAMPLES = Path(__file__).resolve().parents[2] / "examples"


def _canvas_with_captured_js(qtbot):  # type: ignore[no-untyped-def]
    from otko.views.canvas_plotly import PlotlyCanvas

    canvas = PlotlyCanvas()
    qtbot.addWidget(canvas)
    # Pretend the page finished loading, then capture instead of running JS.
    canvas._ready = True
    calls: list[str] = []
    canvas._eval = lambda js: calls.append(js)  # type: ignore[method-assign]
    return canvas, calls


def _parse_call(call: str) -> tuple[dict, bool]:
    """Split a captured ``window.otkoUpdate(<json>, <flag>)`` call."""
    body = call[len("window.otkoUpdate(") : -1]
    literal, _sep, flag = body.rpartition(", ")
    return json.loads(json.loads(literal)), flag == "true"


@pytest.mark.gui
def test_framing_push_is_not_marked_preserve_view(qtbot) -> None:  # type: ignore[no-untyped-def]
    canvas, calls = _canvas_with_captured_js(qtbot)

    canvas.show_project(load_project(EXAMPLES / "cantilever.osmodel"))

    assert calls, "show_project must push a figure"
    payload, preserve = _parse_call(calls[-1])
    assert preserve is False, "initial push must be a re-frame"
    # The framing push carries the camera and the padded ranges.
    scene = payload["layout"]["scene"]
    assert "camera" in scene
    assert "range" in scene["xaxis"]
    assert scene["xaxis"]["autorange"] is False
    # plotly's camera lives in normalized scene units: the model is centred on
    # the origin and the eye is only a few units out (not a data-unit distance,
    # which parked the camera hundreds of units away and shrank the model).
    camera = scene["camera"]
    assert camera["center"] == {"x": 0.0, "y": 0.0, "z": 0.0}
    assert (
        camera["eye"]["x"] ** 2 + camera["eye"]["y"] ** 2 + camera["eye"]["z"] ** 2
    ) ** 0.5 < 20.0


@pytest.mark.gui
def test_data_update_preserves_the_view(qtbot) -> None:  # type: ignore[no-untyped-def]
    canvas, calls = _canvas_with_captured_js(qtbot)

    canvas.show_project(load_project(EXAMPLES / "cantilever.osmodel"))
    calls.clear()

    canvas.selection.select_node(1)  # data-only update

    assert calls, "selection change must push"
    payload, preserve = _parse_call(calls[-1])
    assert preserve is True, "data update must preserve the view"
    assert "camera" not in payload["layout"]["scene"], "must not re-send the camera"


@pytest.mark.gui
def test_view_presets_and_reset_re_frame(qtbot) -> None:  # type: ignore[no-untyped-def]
    canvas, calls = _canvas_with_captured_js(qtbot)

    canvas.show_project(load_project(EXAMPLES / "cantilever.osmodel"))

    for action in (canvas.view_xy, canvas.view_xz, canvas.view_yz, canvas.reset_camera):
        calls.clear()
        action()
        assert calls[-1].endswith(", false)"), f"{action.__name__} must re-frame"


@pytest.mark.gui
def test_style_change_keeps_the_view_but_updates_the_layout(qtbot) -> None:  # type: ignore[no-untyped-def]
    """Re-colouring must not snap the camera back to the preset."""
    from otko.views.canvas3d.style import RenderStyle

    canvas, calls = _canvas_with_captured_js(qtbot)
    canvas.show_project(load_project(EXAMPLES / "cantilever.osmodel"))
    calls.clear()

    canvas.set_style(RenderStyle(show_axis_outline=True))

    assert calls, "a style change must push"
    payload, preserve = _parse_call(calls[-1])
    assert preserve is True, "colour changes must not re-frame the view"
    assert payload["layout"]["scene"]["xaxis"]["showgrid"] is True  # layout applied


@pytest.mark.gui
def test_js_console_messages_reach_the_log(qtbot) -> None:  # type: ignore[no-untyped-def]
    """A plotly failure inside the page must not be invisible from Python."""
    from PySide6.QtWebEngineCore import QWebEnginePage

    from otko.views.canvas_plotly.plotly_canvas import _LoggingPage

    messages: list[tuple[str, str]] = []
    page = _LoggingPage(lambda msg, severity="info": messages.append((severity, msg)))

    levels = QWebEnginePage.JavaScriptConsoleMessageLevel
    page.javaScriptConsoleMessage(levels.ErrorMessageLevel, "boom", 7, "file:///tmp/plot.html")
    page.javaScriptConsoleMessage(levels.WarningMessageLevel, "careful", 8, "file:///tmp/plot.html")
    page.javaScriptConsoleMessage(levels.InfoMessageLevel, "hello", 9, "")

    assert messages == [
        ("error", "[web] plot.html:7 boom"),
        ("warning", "[web] plot.html:8 careful"),
        ("info", "[web] plotly:9 hello"),
    ]


@pytest.mark.gui
def test_deformed_push_colours_by_scalar_and_ghosts_the_reference(qtbot) -> None:  # type: ignore[no-untyped-def]
    """The canvas wiring drives the builder's contour + ghost overlays."""
    import numpy as np

    from otko.services.deformation import DeformationSource
    from otko.views.canvas3d.model_renderer import RendererMode

    canvas, calls = _canvas_with_captured_js(qtbot)
    project = load_project(EXAMPLES / "cantilever.osmodel")
    canvas.set_project(project)
    ids = [node.id for node in project.nodes]
    source = DeformationSource(
        displacements=np.zeros((len(ids), 3)) + np.linspace(0, 1, len(ids))[:, None],
        node_id_to_row={nid: i for i, nid in enumerate(ids)},
    )

    canvas.set_mode(RendererMode.DEFORMED, source)
    canvas.set_show_undeformed(True)
    calls.clear()
    canvas.render()

    payload, _preserve = _parse_call(calls[-1])
    names = {trace.get("name") for trace in payload["data"]}
    assert "undeformed-reference" in names
    nodes = next(t for t in payload["data"] if t.get("name") == "nodes")
    assert nodes["marker"]["showscale"] is True
    assert nodes["marker"]["colorbar"]["title"]["text"] == "|u|"


@pytest.mark.gui
def test_animation_push_carries_prebuilt_frames(qtbot) -> None:  # type: ignore[no-untyped-def]
    """``animate`` must hand plotly a frame list, not drive Python re-renders."""
    import numpy as np

    from otko.services.deformation import DeformationSource
    from otko.views.canvas_plotly.trace_builder import SceneOptions

    canvas, calls = _canvas_with_captured_js(qtbot)
    project = load_project(EXAMPLES / "cantilever.osmodel")
    canvas.set_project(project)
    canvas._scene = canvas._builder.build(project, SceneOptions())

    ids = [node.id for node in project.nodes]
    options = [
        SceneOptions(
            deformation=DeformationSource(
                displacements=np.full((len(ids), 3), float(k)),
                node_id_to_row={nid: i for i, nid in enumerate(ids)},
            )
        )
        for k in (1.0, 2.0, 3.0)
    ]
    canvas.animate(options, duration_ms=25, loops=4)

    assert calls and calls[-1].startswith("window.otkoAnimate(")
    body = calls[-1][len("window.otkoAnimate(") :]
    literal, end = json.JSONDecoder().raw_decode(body)
    payload = json.loads(literal)
    assert len(payload["frames"]) == 3
    assert payload["frames"][0]["data"], "frames must carry trace data"
    assert body[end:].startswith(", 25, 4, true")